// SPDX-License-Identifier: GPL-2.0#include <linux/fault-inject.h>#include <linux/debugfs.h>#include <linux/error-injection.h>#include <linux/mm.h> static struct {	struct fault_attr attr; 	bool ignore_gfp_highmem;	bool ignore_gfp_reclaim;	u32 min_order;} fail_page_alloc = {	.attr = FAULT_ATTR_INITIALIZER,	.ignore_gfp_reclaim = true,	.ignore_gfp_highmem = true,	.min_order = 1,}; static int __init setup_fail_page_alloc(char *str){	return setup_fault_attr(&fail_page_alloc.attr, str);}__setup("fail_page_alloc=", setup_fail_page_alloc); bool should_fail_alloc_page(gfp_t gfp_mask, unsigned int order){	int flags = 0; 	if (order < fail_page_alloc.min_order)		return false;	if (gfp_mask & __GFP_NOFAIL)		return false;	if (fail_page_alloc.ignore_gfp_highmem && (gfp_mask & __GFP_HIGHMEM))		return false;	if (fail_page_alloc.ignore_gfp_reclaim &&			(gfp_mask & __GFP_DIRECT_RECLAIM))		return false; 	/* See comment in __should_failslab() */	if (gfp_mask & __GFP_NOWARN)		flags |= FAULT_NOWARN; 	return should_fail_ex(&fail_page_alloc.attr, 1 << order, flags);}ALLOW_ERROR_INJECTION(should_fail_alloc_page, TRUE); #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS static int __init fail_page_alloc_debugfs(void){	umode_t mode = S_IFREG | 0600;	struct dentry *dir; 	dir = fault_create_debugfs_attr("fail_page_alloc", NULL,					&fail_page_alloc.attr); 	debugfs_create_bool("ignore-gfp-wait", mode, dir,			    &fail_page_alloc.ignore_gfp_reclaim);	debugfs_create_bool("ignore-gfp-highmem", mode, dir,			    &fail_page_alloc.ignore_gfp_highmem);	debugfs_create_u32("min-order", mode, dir, &fail_page_alloc.min_order); 	return 0;} late_initcall(fail_page_alloc_debugfs); #endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */